Pneumatic pump.



T. DAVIS.

PNEUMATIO PUMP.

APPLIoAToN rum MAR. s, 1909.

969,847. Patented Sept. 13,1910.

ATTORNEYS UNITED STATES RATENT OFFICE.

THOMAS DAVIS, OF ORANGE, NEW JERSEY, ASSIGNOR TO ORANGE MACHINE ANDMANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

PNEUMATIC PUMP.

To all whom it may concern.'

Be it known that I, THOMAS Davis, a citizen of the United States, andresident of Orange, county of Essex, and State ot New Jersey, haveinvented certain new and use- Jful Improvements in Pneumatic luuips, ofwhich the following is a full, clear, and exact description.

This invention relates more particularly to a pump for forcing' air intoa tank or receptacle to be used in connection with automobiles.

The primary object of the invention is to provide a simple and easilyconstructed pump in which two cylinders may be op` posed and by a rotaryelement to reciprocate the pistons to force air from the cylinders insuccession, and so to construct and mount the parts of the pump thatcomparatively few parts are required.

A further object of the invention is to provide a simple and etlieientdevice which may be readily constructed and assembled, and which may beused for various purposes.

Vith these and other objects in view, the invention will be hereinaftermore particularly described with reference to the accompanying drawings,which form a part ot' this specification, and will then be pointed outin the claims at the end of the description.

In the drawings, Figure 1 is a perspective view of one form of deviceembodying my invention; and Fig. 2 is a sectional View, partly inelevation, through the cylinders, showing the means for operating thepistons.

The frame or support 10 may comprise two end-pieces or legs 11 which areheld together at their upper parts by the longitudinally-extending barsor members l2, arranged on each side and interposed between the bars 12are the cylinders 13 and 14. The end-pieces 11 are cut away, as at 15,to permit the cylinders to enter said recesses, and each cylinder isprovided with lugs 16 which extend from opposite sides thereof and whichare adapted to rest upon the seats 17 of the bars or members 12, andpassing through said lugs and the bars or members 12 are bolts 18 forholding the cylinders rigidly to the bars. The cylinders 13 and 14 areeach open at one end, and their opposite ends are closed by a head 19,and in Specification of Letters Patent.

Application led March 3, 1909.

Patented Sept. 13, 1910.

Serial No. 481,094.

this head is an inlet 20 which is controlled by a suitable check valve21, and leading from each cylinder is an outlet pipe 22 in which isarranged a check valve 23. The pipes 22 of each cylinder may beconnected together, as at 23, and from the connection 23 may lead a pipeto a suitable tank or reservoir, not shown, in which the air, gas, orfluid may be forced from the cylinders and the air or gas held thereinunder pressure to be utilized in any desired manner.

The cylinders 13 and 14 have their ends opposed and in alinement witheach other, and may be supported over the end-pieces 11 of the frame orsupport, and movable in the cylinders are the pistons 24 which may beprovided with suitable packing rings, as 24, and said cylinders may belubricated by the usual oil cups or in any desired way. Each piston isconnected by a rod 25 to the opposite sides of the crosshead 26. Thiscross-head 26 comprises two parts 27 and 28 which are spaced apart bythe blocks 29 to provide a vertically-extending slot opening or guideway 29, in which is adapted to move a bearing or block 30. The parts 27and 28 are held together by the bolts 31, and each of said parts isprovided with a gib or guide 32 which enter grooves in the verticaledges or sides of the block 30, so that said block may move along saidguides. A shaft 32n extends transversely of the frame or device and isprovided with a crank portion 33, the pin 34 of which passes through theblock 30 so that when the shaft 32 and crank portion 33 are rotated theblock 30 will be carried therewith, and during the rotary movementthereof will impart a reciprocatory movement to the cross-head 26 andthereby reciprocate the pistons in the cylinders, and at one stroke ofthe pistons to draw the air or gas within the cylinders, and at the nextstroke force the same past the check valve 23 to the connection 23 to bestored or used for any pur-pose.

Each bar or member 12 of the frame is provided with a boss 35, and overthe boss is a cap 36. The caps 36 and the bosses 35. form together abearing for the shaft 32, and on said shaft 32 are loose and fastpulleys 37 and 38 ot' the usual form by which said shaft may be rotated.Vhen the shaft 32 is rotated by the pulley held thereto, the crankportion will reciprocate the cross-head and thereby move the pistons inthe cylinders to draw the air within the cylinders and then force thesame with the next stroke therefrom thus converting rotary motion into areciprocatory movement without the use of any intervening pivotally heldconnections.

An important advantage of my improved construction of frame is that itmay be readily taken apart for convenience in shipment, and a furtheradvantage is that the crankshaft bearings as well as the cross-head andreciprocating block therein are exposed to facilitate lubrication.

From the foregoing it will be seen that a simple and eiiicient pump isprovided for pumpino air or other gas or fluid into a receptacle orreservoir to be used for various purposes; that the connections betweenthe drivin means and the pistons are substantially direct therebysimplifying and reducing the .number of parts; that by arranging thecylinders onopposite sides of the crosshead, one cylinder is pumpingwhile' the other is drawing air Within the cylinder thus making thesupply of air substantially constant, and that a pump thus constructedmay be readily assembled and may be used for various purposes.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a pneumatic pump, the combination with asupporting frame comprising end pieces, and longitudinal bars connectingsaid end pieces, and formed with semi-circular bosses, of a crank shaftsupported by said bosses, caps secured over said bosses and formingtherewith bearings for saifl shaft, two alined cylinders supported uponthe frame, a cross head between said cyl? inders provided with verticalguides, a block mounted on said shaft and grooved to receive saidguides, piston rods rigidly connected to opposite sides of saidV croSShead and pistons within said cylinders se: cured to said piston rods.

2. In a pneumatic pump, the combination with a supporting frame,comprising end pieces, and longitudinal bars connecting said end pieces,and formed with semi-circular bosses and reinforcing seats, of a crankshaft supported by said bosses, caps secured over said bosses andforming therewith bearings for said shaft, two alined cylinderssupported upon the frame and provided with laterally projecting lugsoverlapping said seats and detachably secured thereto, a cross headbetween said cylinders consisting of side bars formed with verticalguides, and spacing blocks between said side bars, a block mounted onsaid shaft and provided with grooves to receive said guides, piston rodsrigidly connected to opposite sides of said cross head, and pistonswithin said cylinders secured to said piston rods.

This specification signed and witnessed this 25 day of February A. D.1909.

THOMAS DAVIS. Vitnesses:

M. F. KEATING, M. DINNHAUPT.

